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openssl/crypto/pkcs12/p12_npas.c

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/*
* Copyright 1999-2024 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <openssl/pkcs12.h>
#include "p12_local.h"
/* PKCS#12 password change routine */
static int newpass_p12(PKCS12 *p12, const char *oldpass, const char *newpass);
static int newpass_bags(STACK_OF(PKCS12_SAFEBAG) *bags, const char *oldpass,
const char *newpass,
OSSL_LIB_CTX *libctx, const char *propq);
static int newpass_bag(PKCS12_SAFEBAG *bag, const char *oldpass,
const char *newpass,
OSSL_LIB_CTX *libctx, const char *propq);
static int alg_get(const X509_ALGOR *alg, int *pnid, int *piter,
int *psaltlen, int *cipherid);
/*
* Change the password on a PKCS#12 structure.
*/
int PKCS12_newpass(PKCS12 *p12, const char *oldpass, const char *newpass)
{
/* Check for NULL PKCS12 structure */
if (p12 == NULL) {
ERR_raise(ERR_LIB_PKCS12, PKCS12_R_INVALID_NULL_PKCS12_POINTER);
return 0;
}
/* Check the mac */
if (p12->mac != NULL) {
if (!PKCS12_verify_mac(p12, oldpass, -1)) {
ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_VERIFY_FAILURE);
return 0;
}
}
if (!newpass_p12(p12, oldpass, newpass)) {
ERR_raise(ERR_LIB_PKCS12, PKCS12_R_PARSE_ERROR);
return 0;
}
return 1;
}
/* Parse the outer PKCS#12 structure */
static int newpass_p12(PKCS12 *p12, const char *oldpass, const char *newpass)
{
STACK_OF(PKCS7) *asafes = NULL, *newsafes = NULL;
STACK_OF(PKCS12_SAFEBAG) *bags = NULL;
int i, bagnid, pbe_nid = 0, pbe_iter = 0, pbe_saltlen = 0, cipherid = NID_undef;
PKCS7 *p7, *p7new;
ASN1_OCTET_STRING *p12_data_tmp = NULL, *macoct = NULL;
unsigned char mac[EVP_MAX_MD_SIZE];
unsigned int maclen;
int rv = 0;
if ((asafes = PKCS12_unpack_authsafes(p12)) == NULL)
goto err;
if ((newsafes = sk_PKCS7_new_null()) == NULL)
goto err;
for (i = 0; i < sk_PKCS7_num(asafes); i++) {
p7 = sk_PKCS7_value(asafes, i);
bagnid = OBJ_obj2nid(p7->type);
if (bagnid == NID_pkcs7_data) {
bags = PKCS12_unpack_p7data(p7);
} else if (bagnid == NID_pkcs7_encrypted) {
bags = PKCS12_unpack_p7encdata(p7, oldpass, -1);
if (p7->d.encrypted == NULL
|| !alg_get(p7->d.encrypted->enc_data->algorithm,
&pbe_nid, &pbe_iter, &pbe_saltlen, &cipherid))
goto err;
} else {
continue;
}
if (bags == NULL)
goto err;
if (!newpass_bags(bags, oldpass, newpass,
p7->ctx.libctx, p7->ctx.propq))
goto err;
/* Repack bag in same form with new password */
if (bagnid == NID_pkcs7_data)
p7new = PKCS12_pack_p7data(bags);
else
p7new = PKCS12_pack_p7encdata_ex(pbe_nid, newpass, -1, NULL,
pbe_saltlen, pbe_iter, bags,
p7->ctx.libctx, p7->ctx.propq);
if (p7new == NULL || !sk_PKCS7_push(newsafes, p7new))
goto err;
sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
bags = NULL;
}
/* Repack safe: save old safe in case of error */
p12_data_tmp = p12->authsafes->d.data;
if ((p12->authsafes->d.data = ASN1_OCTET_STRING_new()) == NULL)
goto err;
if (!PKCS12_pack_authsafes(p12, newsafes))
goto err;
if (p12->mac != NULL) {
if (!PKCS12_gen_mac(p12, newpass, -1, mac, &maclen))
goto err;
X509_SIG_getm(p12->mac->dinfo, NULL, &macoct);
if (!ASN1_OCTET_STRING_set(macoct, mac, maclen))
goto err;
}
rv = 1;
err:
/* Restore old safe if necessary */
if (rv == 1) {
ASN1_OCTET_STRING_free(p12_data_tmp);
} else if (p12_data_tmp != NULL) {
ASN1_OCTET_STRING_free(p12->authsafes->d.data);
p12->authsafes->d.data = p12_data_tmp;
}
sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
sk_PKCS7_pop_free(asafes, PKCS7_free);
sk_PKCS7_pop_free(newsafes, PKCS7_free);
return rv;
}
static int newpass_bags(STACK_OF(PKCS12_SAFEBAG) *bags, const char *oldpass,
const char *newpass,
OSSL_LIB_CTX *libctx, const char *propq)
{
int i;
for (i = 0; i < sk_PKCS12_SAFEBAG_num(bags); i++) {
if (!newpass_bag(sk_PKCS12_SAFEBAG_value(bags, i), oldpass, newpass,
libctx, propq))
return 0;
}
return 1;
}
/* Change password of safebag: only needs handle shrouded keybags */
static int newpass_bag(PKCS12_SAFEBAG *bag, const char *oldpass,
const char *newpass,
OSSL_LIB_CTX *libctx, const char *propq)
{
EVP_CIPHER *cipher = NULL;
PKCS8_PRIV_KEY_INFO *p8;
X509_SIG *p8new;
int p8_nid, p8_saltlen, p8_iter, cipherid = 0;
const X509_ALGOR *shalg;
if (PKCS12_SAFEBAG_get_nid(bag) != NID_pkcs8ShroudedKeyBag)
return 1;
if ((p8 = PKCS8_decrypt_ex(bag->value.shkeybag, oldpass, -1,
libctx, propq)) == NULL)
return 0;
X509_SIG_get0(bag->value.shkeybag, &shalg, NULL);
if (!alg_get(shalg, &p8_nid, &p8_iter, &p8_saltlen, &cipherid)) {
PKCS8_PRIV_KEY_INFO_free(p8);
return 0;
}
if (cipherid != NID_undef) {
cipher = EVP_CIPHER_fetch(libctx, OBJ_nid2sn(cipherid), propq);
if (cipher == NULL) {
PKCS8_PRIV_KEY_INFO_free(p8);
return 0;
}
}
p8new = PKCS8_encrypt_ex(p8_nid, cipher, newpass, -1, NULL, p8_saltlen,
p8_iter, p8, libctx, propq);
PKCS8_PRIV_KEY_INFO_free(p8);
EVP_CIPHER_free(cipher);
if (p8new == NULL)
return 0;
X509_SIG_free(bag->value.shkeybag);
bag->value.shkeybag = p8new;
return 1;
}
static int alg_get(const X509_ALGOR *alg, int *pnid, int *piter,
int *psaltlen, int *cipherid)
{
int ret = 0, pbenid, aparamtype;
int encnid, prfnid;
const ASN1_OBJECT *aoid;
const void *aparam;
PBEPARAM *pbe = NULL;
PBE2PARAM *pbe2 = NULL;
PBKDF2PARAM *kdf = NULL;
X509_ALGOR_get0(&aoid, &aparamtype, &aparam, alg);
pbenid = OBJ_obj2nid(aoid);
switch (pbenid) {
case NID_pbes2:
if (aparamtype == V_ASN1_SEQUENCE)
pbe2 = ASN1_item_unpack(aparam, ASN1_ITEM_rptr(PBE2PARAM));
if (pbe2 == NULL)
goto done;
X509_ALGOR_get0(&aoid, &aparamtype, &aparam, pbe2->keyfunc);
pbenid = OBJ_obj2nid(aoid);
X509_ALGOR_get0(&aoid, NULL, NULL, pbe2->encryption);
encnid = OBJ_obj2nid(aoid);
if (aparamtype == V_ASN1_SEQUENCE)
kdf = ASN1_item_unpack(aparam, ASN1_ITEM_rptr(PBKDF2PARAM));
if (kdf == NULL)
goto done;
/* Only OCTET_STRING is supported */
if (kdf->salt->type != V_ASN1_OCTET_STRING)
goto done;
if (kdf->prf == NULL) {
prfnid = NID_hmacWithSHA1;
} else {
X509_ALGOR_get0(&aoid, NULL, NULL, kdf->prf);
prfnid = OBJ_obj2nid(aoid);
}
*psaltlen = kdf->salt->value.octet_string->length;
*piter = ASN1_INTEGER_get(kdf->iter);
*pnid = prfnid;
*cipherid = encnid;
break;
default:
pbe = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBEPARAM), alg->parameter);
if (pbe == NULL)
goto done;
*pnid = OBJ_obj2nid(alg->algorithm);
*piter = ASN1_INTEGER_get(pbe->iter);
*psaltlen = pbe->salt->length;
*cipherid = NID_undef;
ret = 1;
break;
}
ret = 1;
done:
if (kdf != NULL)
PBKDF2PARAM_free(kdf);
if (pbe2 != NULL)
PBE2PARAM_free(pbe2);
if (pbe != NULL)
PBEPARAM_free(pbe);
return ret;
}
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